Marine boiler.



KING.

MARINE BOILER.

APPLICATION FILED JULY 1, 1912,

1,057,062. Patented Mar. 25, 1913.

ZMYIZGOdGd. a Inventor Yn- W t W .zlilmizey COLUMBIA PLANDGRAPH 60.,wAsl-IINGTON. D. c.

EDWARD KING, or ZURICH, SWITZERLAND.

MARINE BOILER.

Specification of Letters Patent.

Patented Mar. 25, 1913.

Application filed July 1, 1912. Serial No. 706,860.

To all whom it may concern:

Be it known that I, EDWARD KING, a subject of the King of Great Britainand Ireland, and residing at 51 Kilchbergstrasse, Zurich, Switzerland,have invented certain new and useful Improvements in Marine Boilers, ofwhich the following is a specification.

This invention relates to marine boilers.

Fire tube marine boilers are known in which a separate water circulatingtube extends from the furnace tube at a point thereof near the rear wallof the combustion chamber in which the direction of the gases isreversed, and passes longitudinally of the said furnace tube to theupper part of the furnace tube in front of the front Wall of the saidcombustion chamber.

The present invention relates to aspecial construction of boiler of thiskind, the boiler being a double boiler with a common combustion chamber.It is obvious that in this case the water circulating tube of eachsingle half of the boiler cannot run from the wall of the combustionchamber, which is the rear wall for this half of the boiler and thefront wall of the combustion chamber for the other half of the boiler,and vice versa, in order to send the water in the lower part of theboiler upwardly and obtain a vigorous circulation of the water. Thisdifiiculty is obviated according to the present invention by combining,in such double boilers which have a common combustion chamber, the watercirculating tube of one half of the boiler, with the water circulatingtube of the other half of the boiler, underneath the combustion chamber,and leading both as one tube o the lower part of the furnace tube.

The accompanying diagrammatic drawing illustrates a double boileraccording to this invention in longitudinal section.

a is the boiler shell, Z) the furnace tube 0 the groups of fire tubes ofthe left hand half of the boiler, and 0 the groups of fire tubes of theright hand half of the boiler, cl is the common combustion chamberwherein the direction of the gases is changed. The two water circulatingtubes 2 and 2 extend longitudinally of the furnace tube 6 in a forwarddirection that is to say toward the fire doors of the respective halvesof the boiler, and each extends from the upper part of the furnace tubeat a part thereof in front of the corresponding wall of the combustionchamber cl into the water chamber.

The two tubes pass underneath the combustion chamber 03 and communicatewith a single tube .2 that extends through the lower part of the furnacetube at apart about midway of its length. In this arrangement, as in theknown single boiler, there is a vigorous circulation of the water fromthe bottom upwardly, as well as for each half of the boiler from therear; that is to say for the boiler as a whole from the middlepartt-hereof outwardly and toward the front of the boiler inwardly insuchwise that the water is supplied to the fire tubes not only from thetop and from the sides of the boiler but also for each half of theboiler from the rear and from below. In like manner the circulation, ofthe water for each half of the boiler takes place in a contrarydirection to the passage of the flame of the particular half of theboiler and in an upward direction so that any unequal expansion andconsequent leakages are prevented.

In consequence of the immediate commencement of the circulation and therapid heating up of the double boiler thereby caused, and on account ofthe increase of the heating surface by the circulation tubes 2, a a,built into the most effective part of the boiler, and finally'inconsequence of the protection of the corners against blowpipe flames,etc., the present arrangement possesses the same advantage as the singleboiler.

Having now described my invention what I claim as new and desire tosecure by Letters Patent is:-

1. In a fire tube marine double boiler, having a furnace tube fired fromboth ends and a common combustion chamber wherein the direction of thegases is changed, the combination of water circulating tubes extendingfrom the water space of each half of the boiler at either end of thecommon combustion chamber and at the upper part of the furnace tube, anda tube common to said water circulating tubes extending through thelower part of said furnace tube.

2. I11 a fire tube marine double boiler, having a furnace tube firedfrom both ends and a common combustion chamber wherein the direction ofthe gases is changed, the combinati-on of water circulating tubesextending from the water space of each half of the boiler at either endof the common combustion chamber and at the upper part of the furnacetube said tubes combining to form a single tube which extends downwardlythrough the lower part of the furnace tube at a part about mid-way ofits length.

3. In a fire tube marine double boiler, having a furnace tube fired fromboth ends and a common combustion chamber wherein the direction of thegases is changed, the combination of water circulating tubes extendingfrom the water space of each half of the boiler at the upper part of thefurnace tube and in front of the combustion chamber said tubes extendingunderneath the combustion chamber, and a tube common to said watercirculating tubes extending downwardly through the lower part of thefurnace tube.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

EDWARD KING.

Witnesses:

AUGUST RUEGG, MARTIN PLONDA.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

